Merge pull request #76 from jokerdino/master

Reducing differences between master and devel branch
Returned symbolic icon function.
Merge pull request #77 from snwh/master

Returned symbolic icon function.
Added support for window resize colouring.
Merge pull request #78 from snwh/master

Added support for window resize colouring.
Fixed bug 1129262 - 'Display remaining battery life doesn's go off'.
Merge pull request #79 from snwh/master

Fixed bug 1129262 - 'Display remaining battery life doesn's go off'.
Fixed packaging issues raised by Ubuntu sponsors team
Added tooltip markup for missing schema / key
Alignment issues in debian/control long description field
Using debian/compat level 9
Undo symbolic icons to workaround LP:1129326